Agenda/Minutes of the VIS Meeting on 2018/5/25

2018/5/25 13:30 -

Participants:

Progress report

Schedule Chart

Type-A : (PDF/MPP)

Type-B: (PDF/MPP)

Type-A (Takahashi)

Past week report

(after 14th May)

[X-front]

• Swapped the IP. The wrong IP (for SR) was removed and packed.
• Installed the right IP into the clean booth and combined it with the TF. One threaded hole to fix the IP leg was not good, but repaired by tapping.
• Installed the PI into the top chamber.
• Cabled from the PI to the feedthroughs.
• Calibrated the horizontal LVDSs for the IP.
• Put the ballast rings and three ACC units on the IP.
• Adjusted the horizontal position of IP, the vertical position of TF, and the yaw position of BF damper.
• Measured the spectrum of IP by the LVDT. The lowest mode frequency was 50mHz.
• Attached the LVDT coils onto the BF and the support ring. Confirmed the signals with the driver.
• Checked the keystone height of F1-F3. Added the ballast mass of 276g on the BF.
• Fastened the screws for the feedthrough flanges.
• Cabled for the ACCs.
• The PEEK gender changer used on the ACC unit was flip connector like the feedthrough. The pre-amplifier in the ACC2 unit was broken.
• Checked the signals of ACC1-3 using the new cables. They worked.
• Attached the adjustment screw for the yaw rotation of receptacle in the TF.
• Closed the top chamber. The installation of Type-A tower was finished except control part.

[Y-front]

• Started the preparation of the site.
• Cleaned the booth. Set the SUS sheets on the floor. Transported some items.

[Maraging blade]

• The cutting of 26 blades was finished and delivered on 21th.
• The aging was finished and delivered today (25th).
• The 12 blades will be coated in the next week.

Plan for coming weeks

• Transport the DP from the X-end to the Y-front.
• Start the assembly of DP and BF damper in Y-front.

Type B (Mark)

Past week report

• LBB ballast masses are ordered. Will be delivered by 6/23.
• SRM 2D drawing is in preparation.

Plan for coming weeks

Type-Bp (Shoda)

Past week report

Plan for coming weeks

OMMT & OSTM (Ohishi)

Past week report

Plan for coming weeks

LVDT Driver (Tanaka)

Past week report

• The problem of P 0 was found to be due to a failure of U 25 (THAT 1646).
  • I replaced the U25 and completed the repair.
  • I could not confirm the problem of P3 being noisy in this environment.
  • It is necessary to check again in KAGRA side.

  • Report on failure diagnosis and repair of LVDT driver (JGW-E1808252)PDF

Plan for coming weeks

• I'm working on designing and researching them.

Other site works

Safety

• Incidents:
• Foreseen risks
  • Type-A:
  • Type-B:
  • Type-Bp:

Discussion

• Order of high power coil drivers

Travel Plans

• Travel (Week of 5/28):
  • Takahashi:
  • Okutomi:
  • Sato:
  • Ishizaki:
  • Mark:
  • Hirata:
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):
• Travel (Week of 6/4):
  • Takahashi:
  • Okutomi:
  • Sato:
  • Ishizaki:
  • Mark:
  • Hirata:
  • Enzo:
  • Shoda:
  • Ohishi:
  • Fujii:
  • Tanioka:
  • Tanaka:
  • Kozu (ICRR):
  • Arai (ICRR):

Next meeting

On 2018/6/1(Fri)